﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Shape a = new Circle(5);
            a.CallArea(a);
            Shape b = new Square(5);
            b.CallArea(b);
        }

    }
}
